VulnerabilityModified
CVE-2026-34734
In 1.14.1-2 and earlier, a heap-use-after-free was found in the h5dump helper utility.
HIGH 7.8EPSS 0.19%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
HDF5 is software for managing data. In 1.14.1-2 and earlier, a heap-use-after-free was found in the h5dump helper utility. An attacker who can supply a malicious h5 file can trigger a heap use-after-free. The freed object is referenced in a memmove call from H5T__conv_struct. The original object was allocated by H5D__typeinfo_init_phase3 and freed by H5D__typeinfo_term.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 0.19% probability · 9th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-825
- Affected
- hdfgroup/hdf5
- Source
- security-advisories@github.com
References
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-w7v2-9cmr-pwwjExploit, Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-34734
- https://bugzilla.redhat.com/show_bug.cgi?id=2457034
- https://github.com/HDFGroup/hdf5/security/advisories/GHSA-w7v2-9cmr-pwwjExploit, Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34734.json
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.